Suggestion for a document class in Qt that would be something like NSDocument in Cocoa

It would be useful to have a document class that would handle automatic interaction with the user for common
tasks. Something like NSDocument in Cocoa.

For example it would pop up automatically dialogs that will ask the user if he wants to save his changes,
http://developer.apple.com/documentation/UserExperience/Conceptual/OSXHIGuidelines/XHIGWindows/chapter_17_section_6.html#//apple_ref/doc/uid/20000961-DontLinkElementID_47